Electrical signal device mounting and installation



July 13, 1954 A. MELESKI 2,683,871

ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION Filed Aug. 8, 1951 3Sheets-Sheet l a 26 l6 22 30 5b W01 5/: /6 9 ./6 l6 July 13, 1954 A.MELESKI 2,683,871

ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION Filed Aug. 8, 1951 3Sheets-Sheet 2 QZ2"9.7. 7? k8 gil f 9 a? i 3/ 9L JL 1 79 793/ 5;

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20 n n 7 2 68 35 23! 17 1 E A. L. MELESKI ELECTRICAL SIGNAL DEVICEMOUNTING AND INSTALLATION 3 Sheets-Sheet 3 Filed 1951 IVZZM W PatentedJuly 13, 1954 UNlTED TENT OFFICE ELECTRICAL SIGNAL DEVICE MOUNTING ANDINSTALLATION Anthony L. Meleski, New York, N. Y., assignor to EdwardsCompany, Inc., Nor-walk, Conn, a corporation of New York 19 Claims. 1

This invention relates to signaling devices, par ticularly electricalsignaling devices such as electric gongs, bells, and the like, and moreparticularly to the housing, mounting, and installation of electricsignaling devices.

This application is a continuation-in-part of my application Serial No.142,430, filed February 1-, 1950, now abandoned.

One of the objects of this invention is to provide housing and mountingmeans for such devices suitable for either indoors or outdoors. Anotherobject is to provide a housing construction for electric signalingdevices, particularly of the audible type, that will have readyadaptability and that will also have good adaptability for meetingvarious requirements for installation or mounting in practical use.

Another object is to provide a support for signaling devices of theabove-mentioned character a mounting means therefor which can beembodied in simple, economical, and compact structural form and whichmay be readily assembled and mounted.

Another object is to provide a construction of the above-mentionedcharacter which will provide a wide range of adaptability ofinstallation in relation to various types of wiring systems with whichthe electric signaling device is to be associated, while at the sametime retaining the advantages of ease, simplicity, and dependability ofassembly. Another object is to carry out this last-mentioned object withstructural features embodying relatively few parts and so interrelatedas to achieve practical foolproofness in carryin on and completing anygiven installation.

Another object is to provide an inexpensive and practical housing andsignalin device assembly which will be capable of economical manufactureand ease of assembly, and constructed and arranged to coact with amounting means therefor insure ease and dependability of installationand, in its preferred form, to be capable also of wide adaptability tovarious mounting and wiring requirements. More particularly, anotherobject is to provide a signalin device assembly and mounting of thejust-mentioned character to carry a gong or the like or othersound-emitting device externally and electrical actuating mechanismtherefor internally, embodying structural features facilitating assemblyand setting thereof in relation to each other and includin in themounting means dependable provision for insuring installation withoutdetrimental impairment of the signal actuation and action.

Other objects will be in part obvious or in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combination of elements, and arrangement of parts as will be exemplifiedin the structure to be hereinafter described and the scope of theapplication of which will be indicated in the following claims.

In the accompanying drawings in which are shown two illustrativeembodiments each having adaptability to various types of installationand w ring systems and in which similar reference characters refer tosimilar parts throughout.

Figure 1 is a central vertical sectional view of one illustrative formof signaling device support or housing assembled to its mounting plateand illustratively thereby mounted on a wall to illustrate asurface-mounted installation;

Figure 2 is a rear elevation of the mounting plate as seen from theright in Figure 1, with the mounting plate partly broken away and beingshown disassembled from the rest of the mechanism;

Figure 3 is a rear elevation of the device as seen from the right inFigure 1 with the mounting plate and the insulating separator plateremoved, showin in elevation certain features of the assembly, to form asubunit, of the signaling device and its housing-like support;

Figure 4 is an elevation as seen along the line 4 4 of Figure 1 showincertain relationships between a connector element of the mounting platesubassembly and the signaling device subassembly, that relationshipbeing also embodied in other forms shown in the drawings as indicated bythe line i4 of Figure '7 and also of Figure 9;

Figure 5 is a fragmentary horizontal sectional view through theassembled signaling device subassembly and mounting plate subassembly ofFigure 1, showing them secured to or mounted on a special form of outletbox;

Figure 6 is a fragmentary horizontal sectional view as seen along theline 6-5 of Figure 3 showin certain preferred structural features wherethe signal-actuating means utilizes a permanent magnet;

Figure '7 is a central vertical sectional view, on a somewhat smallerscale, of a modified form of signa1-actuating mechanism and housinsubassembly coacting with a modified form of mounting plate, all shownin Figure 7 as secured, illustratively, to a wall surface as in asurfacemounted installation;

Figure 8 is an elevation as seen along the line 88 of Figure l, partlybroken away, showing more particularly the mounting plate subassemblyand certain structural features of coaction thereof with the housingsubassembly;

Figure 9 is a detached fragmentary horizontal sectional view as seenalong the line 9-9 of Figure 3.

Figure 10 is an elevation as seen from the right in Figure '7 of thesignaling device and housing subasscmbly as it is seen detached from themounting plate subassembly and with the insulating separator plateremoved, being also partly insection;

Figure 11 is a fragmentary sectional view as seen along the line Iili ofFigure 10 showing certain structural features of assembly where theelectric signal-actuating means embodies a permanent magnet, and,

Figure 12 is a vertical sectional view like that of Figure 7 but on anenlarged scale, showing the assembled signaling subassembly and mountingplate subassembly in coacting relationship with a special form of outletbox.

Referring first to Figures 1 and 3, the electric signaling device, forpurposes of illustration of certain features of my invention, comprisesan electromagnetic winding l which is to be connected to an electriccircuit and which forms part of a signal-actuating mechanism which is tobe suitably mounted and supported in the desired location and whichpreferably forms part of a subassembly of which another part comprises amain support which is preferably constructed in the form of a housinggenerally indicated by the reference character it and Within which theelectrical actuating mechanism is mounted and secured. In theillustrative embodiment the signaling device is of the audible type suchas a bell and in such case it is provided with a gong I! which ispreferably and conveniently mounted externally of the housing l6. As isbetter shown in Figure 1, the housing I6, which is somewhat dome-shaped,has a sub-- stantial portion thereof extending into and enveloped by theend or peripheral portions of the gong which may be secured to thehousing as by a cap screw I8 provided with a suitable spring lock washeri9 threaded into a suitably reinforced portion of the housing It. Thelatter, as appears also from Figure 3, is generally circular in sectionand in the illustration the gong I1 is mounted coaxially with thehousing IS.

The signal device and its support or housing, assembled in the form of asubassembly as is later described, are to be mounted to a suitablesupport such as the vertical face of a wall, either directly thereto, asto the wall W in Figure l where the circuit wiring may be so-calledexposed surface wiring, or to the usual type of outlet box usuallyrecessed in a wall where the wiring may be of the concealed or conduittype, or for outdoor or weatherproof mounting in sealed relation to acoacting outlet box provided with weatherproof conduit or like wiring.To facilitate such mounting, of which the just mentioned illustrate avariety of requirements to be met, a mounting plate generally indicatedby the reference character 26 (Fi ures 1 and 2) is provided, constructedand coacting as later described. For many installations, particularlyfor outdoor use and where the signaling device comprises anexternally-mounted gong as in Figure 1, it is preferable that the gongstriker part of the internally-mounted electric actuating mechanism haveaccess to the gong through a lowermost portion of the housing and, asbetter shown in Figdislodgement from their holes.

ures 1 and 3, I provide an aperture ifi in the wall of the housing I6itself and through the aperture I6 the gong striker 2| is actuatable toimpact the gong H. For this and other advantages I also make provision,as is later described, to insure that the housing and signalingsubasseinbly are assembled to the mounting plate consistently in thedesired relationship.

The housing 16 which is desirably die-cast, While substantiallydome-shaped, is stepped, its side wall having a plurality of setbacks;thus it has a plurality of substantially cylindrical wall portions 6 [6,and It of successively different diameters joined by intermediate orlaterallyextending annular wall portions IG and l6 the planes of whichare conveniently substantially at right angles to the axis of thehousing. A similar lateral portion Iii joins portion li to the endpartially-spherical portion I6 The portions 16, IB and H5 formtransverse flange-like ledges and are adapted to coact with other partsas later described.

The portion 16 (Figure 1) is of appropriate radial extent externally tobe provided with diametrically-opposed holes 22 and 23 and toaccommodate the heads of screws 2 and 25, respectively, which extendthrough the holes and are held against movement out of the holes bysplit rings 26 and 2'1, respectively; the screws 24 and 25 are thus heldassembled to the housing While being freely rotatable relative theretoand their threaded shanks extend rearwardly (to the right in Figure 1)to an extent less than the axial extent of the housing portion l6. Thethreaded ends of the screw thus terminate well within the plane of therear end of the housing and, if desired, they may be provided withreduced-diametered end portions for ease of entry intodiametrically-opposed threaded holes and 20* (see Figure 2) of themounting plate 28. The casing portion IB also forms an annular seat fora cushioning and scaling gasket ring 36 preferably made of rubber and ofsubstantial thickness, and coacting to hold the ring 30 in place is thecasing portion [6 against which the ring 39 peripherally engages. Ring39 is provided with diametricallyopposed apertures through which thescrews 24 and pass. These apertures may be made smaller than the pitchdiameter of the threaded shanks of the screws so that the ring 35, eventhough it fits snugly within the cylindrical casing portion 16 isthereby held against dislodgement from its seat, and this arrangementmay also be used to hold the screws 2 and 25 against These features areof advantage with or without the split rings 26 and 21 in maintainingassemblage of these parts during handling and packaging as well asduring installation and attachment to the mounting plate.

The mounting plate 20, which may be a stamping but is preferably ofdie-cast construction, is disc-like or circular and is of a maximumdiameter somewhat less than the internal diameter a of the end casingportion it (Figure 1), and adjacent its periphery and projecting out ofits plane the plate 20 is provided with an annular flange 3| which inits preferred form is V-shaped in cross section as is shown in fulllines in Figure 5 and in broken lines in Figure 1. In horizontal oraxial dimension as seen in Figures 1 and 5 the casing end flange orportion l6 and the mounting plate flange 3| are about the same so thatwith the annular apex of the V-shaped flange 3i resting against therubber ring 30 and the screws 2 t and 25 threaded into the mountingplate holes 23* and 29 the yieldable ring 30 may be compressed to thedesired extent before the end edge of casing portion 16 reaches theplane of the rear face of the mounting plate 26 as the two parts aretelescoped together under the tightening action of the two screws.Adequate compression of the ring 39 is thus always assured even thoughmounting plate 253 may rest flush against a wall face or the like. Thescrew holes 25 and 26 of the mounting plate 26 (Figure 2), in theillustrative embodiment, pass through the of the V-shaped flange 3i andpreferably the latter is provided with bosses 25 and 25 which fill inthe trough on the rear side of the V-shaped flange at the selecteddiametricallyopposed points so as to provide greater axial length andmore metal for the screw holes and ,2 8

Between the transverse or flange-like casing portions it and [5 (Figurel) the inner surface of the cylindrical wall portion it is internallystepped or rabbetted circumferentially as at Mi (Figures 1 and 3) and atspaced intervals therealong is provided a plurality of bosses 33 (Figure3), illustratively three in number, provided with threaded holes dreceive screws 3 3. In the step or rabbet i t is seated a disc-likeinsulating plate 3? (Figure 1) and it is held in place by the screws Ei. Plate 3i closes off the interior of the casing it and covers over theapparatus and mechanism mounted therein, as about to be described; theseparator plate 3's serves also to exclude dust and the like from theinterior of the housing and to prevent installation wires associatedwith the mounting plate 2%, as is later described, from contacting theelectric signal-actuating mechanism contained within the housing It; italso shields the signaling mechanism during handling or installation ofthe housing and signaling subassembly.

In its preferred form the separator plate 3? also coacts with themounting plate subassembly to insure the desired orientation of theformer relative to the latter, upon installation. For this purpose Ipreferably provide the mounting plate with an aperture 3'. (Figures 1and 4) which is off-center and radially displaced from the center of thedisc-like plate 31. Aperture 3%, as is better shown in Figure 1, isadapted to just receive therein. the foremost or front end portion of asocket or receptacle 38 that is 01": any suitable construction, usuallymade of insulating material, and provided with sockets Bil and 33 forthe disconnectibl reception of two contact prongs; these sockets and 38*are in the front or lefthand end face, as seen in rigure l, or" the receptacle part and, through the aperture 31", are thus presented to theinterior of the housing it. The receptacle part 38 is secured to thefront face or" the mounting plate 2e as by screws "E5 (Figure l) theaded into it and passing through suitable holes in the mounting plate139 and countersunk in the rear faces thereof (Figures 1 and 2). Likethe aperture 3? in the separator plate 3i, receptacle part st, insecuring it to the mounting plate 29, is similarly oif-center radiall"displaced from the center of the mounting plate. lllustratively and asshown in Figures 1 and 2, aperture 3? is off-center along the diame eralong which the screws 25 and 25 are diametrically opposed, and thereceptacle part 38 is similarly oil-center but along the diameter alongwhich screw holes 28 and 2t of the mounting plate 2e are aligned.

Accordingly, with the housing is and mounting plate 29 circular in thedescribed embodiments, the aperture 33* in the separator plate 3'. andthe forwardly projecting part of the receptacle member 38 prevent,during assembly, such relative rotary displacementbetween the casing itand the mounting plate 20 as would misalign the diametrically-opposedscrews in the one end screw holes in the other and thus entry of thescrews into their respective holes in the mounting plate is greatlyexpedited, virtually eliminating the need for manual exploration duringinstallation. This action is aided by the coaction oi the frusto-conicalface of the outer portion of the V- shaped flange 3! with the peripheralflange porticn ifi of the casing id in achieving concentricity ofinterrelationship of the two parts as the one is assembled to the other;these actions are of ner advantage where, as is usually the case, themounting plate 29 is fastened in position at a substantial height fromthe floor. Of coasting aid in these actions are also the two contactprongs l and al of a plug connector element ti which is mounted withinthe casing H5 in a position to project the plug prongs through "theaperture 3i in the separator plate so that as the casing subassembly andthe mounting plate subassembly are brought together as above described,the plug prongs li ll enter the recesses or sockets 38 of the receptaclepart 38 carried by the mounting plate 26. The plug member s! may be ofany suitable construction and usually com prises a body of insulatingmaterial from which the plug prongs project and having suitableconnectine devices such as metal tabs 51 and ti (Figure 3) to whichexternal electrical connection is made to the plug prongs. In theillustrative embodiment the plug member 3! is mounted in position asshown in Figures 1 and 3, juxtaposed to the aperture 33 in the separatorplate 3?, by means of two spaced bosses A2 and 43 formed or castintegrally with the interior wall of the casing it, forming in elfectextensions of the internal annular ledge formed by the casing portionits; the plug member at rests against the aligned faces of these partsand is secured thereto by screws t l (Figure 3). The plug prongs ll iithus project through the separator plate aperture 31* but they terminateshort of the plane of the inner otherwise open end of the casing it,being thus protected during handling, packaging, and the like by thoseportions of the casing ncluding the end portion it that extendrearwardly beyond the plane of the separator plate 3?. To the connectortabs ll 4i (Figure 3) are connected the conductors s5 that lead to theelectric signaling mechanism, to the electromagnetic winding E5 in theillustrative embodiment.

The receptacle part 33 forming part of the mounting plate subassembly isprovided with binding posts to which the heavier circuit conductors ofthe wiring system are connected, and these binding posts preferably takethe form of a pair of screws 46 respectively accommodated in the frontfaces of wing-like lateral extensions 3& and 38 (Figure 2) of the mainbody part of plug receptacle member 33, these wing-like extensions beingof lesser dimension than the main body part of the receptacle as isbet-t r shown in Figure 1. In any suitable manner the binding screws 43are internally in electrical connection with the internal contacts withwhich the plug prongs ll M engage when they are entered into the sockets38 38 The mounting plate 29 is provided with a central round hole 20(Figures 1 and 2) through which the circuit conductors are passed whenthe mounting plate subassembly is secured in position; in Figure 1conductor 41 of the system or circuit wiring are shown passed throughthe hole 25 and they are connected respectively to the binding screws 45of the receptacle part 38; this is done when the mounting plate 20 issecured in position, it being noted that the binding screws areconveniently exposed at the front face of the mounting plate for ease ofelectrical connection. The mounting plate 20 is constructed to meet awide range of installation or wiring requirements or standards. Forexample, it is provided with a goodly number of appropriatelydistributed holes or slots 20 (Figure 2) so located that the plate 20may be secured directly, as a closure plate, to any of the standard 01'like outlet boxes whether surface-mounted or recessed in the wall orflush-mounted in the wall; the holes are preferably so located that thecircular mounting plate 29 is substantially centered to such an outletbox, thus insuring free and easy passage of the circuit conductors 41from the box through the mounting plate aperture 29 whence they areconnected to the binding screws 46.

Also, the mounting plate subassembly is constructed so that it may beinstalled on a wall surface for use in connection with so-called exposedsurface wiring and in such case provision is made to mount it in spacedrelation from the face of the wall W as shown in Figure 1. Preferablythe mounting plate 29] is provided with holes 26 (Figure 2); these holes20 may be distributed in any suitable manner and preferably they arethree in number and disposed in triangular relation. At each hole issecured, to the rear face of the mounting plate 25, so as to form a partof the mounting plate subassembly, an annular stud or spacer 48. Thespacers 48 are secured coaxially with their respective holes 26 so thatscrews 49 (Figure 2) may be passed through the holes and spacers andthreaded into the wall W, thus securing the mounting plate subassemblyto the wall with suflicient space therebetween to accommodate thesurface wiring and to extend the circuit to the aperture 251 for thepassage of the conductors 47 to the front side of mounting plate 20 forconnection to the plug receptacle binding screws 46.

Preferably the spacing studs 48 are secured to the plate 20 in a mannerto permit them to be readily removed; illustratively, and as shown inFigure 1, I may employ a bushing 50 like an eyelet which has one portionpress-fitted into the hollow spacer 48 and another portion spun orexpanded, initially or during assembly, over the front face of the plate29 about the hole 20 The screws 49 pass through the bushing 50 as wellas through the spacer 48, as shown in Figure 1, and where the bushing ismade of a soft metal like soft brass or copper, it has a furtheradvantage of yielding under the tension of the screw head and forming agood securing seat thereagainst for the screw. Part 50 may also be madeof a non-metallic material, like fibre. Where the spacer members 48 arenot needed, as for example when the installation is to be made directlyto a usual or standard outlet box as above described or to the outletbox about to be described, the annular spacers are simply knocked off,the securing bushing or eyelet 5B readily yielding for this purpose.

Furthermore, the mounting plate subassembly is also constructed to coactto achieve a sealed installation, as for example for certain types ofoutdoor uses or installations or other locations where it is desired ornecessary to seal the housing to an outlet box. One such illustrativeembodiment is shown in Figure 5 in which is shown an outlet box 52having a base or back wall 53 and a cylindrical side wall 54 of adiameter commensurate with that of the end casing portion IS the box 52may be of cast construction and in its side wall it has one or morethreaded holes 54 to receive a pipe or conduit through which the circuitconductors are led into the box. Box 52 is secured to its support in anysuitable manner, preferably weatherproof; for example, it may befastened on the face of a wall or recess in a wall and it may beprovided with suitable holes 53 in its back wall to receive securingscrews 55 which are provided with sealing washers 56, which may be offiber.

The front edge face of the cylindrical wall 54 is rabbeted as shown inFigure 5 to provide a forwardly projecting annular rib 54 whose diameterclosely approximates the diameter of the outer frusto-conical part 31*of the V-shaped rib and to provide an annular seat or face 53 thatsubstantially matches the end annular face of the end portion I6 of thehousing It. A sealing washer 51 made of any suitable yieldable material,preferably and illustratively of rubber and having a crosssectionpreferably like that shown in Figure 5, is interposed between the parts[5 and 3i and the ribbed or rabbeted annular end face of the outlet boxside wall 54. As shown, the gasket ring 51 has an annular recess intowhich the annular rib 54 snugly fits; this has the advantage ofpermitting ease of attachment of the gasket ring 5'! to the periphery ofthe outlet box in that the interfitting of the ring with the rib 54achieves a gripping of the latter by the yieldability or resiliency ofthe ring itself and accordingly the workman, after installation of theoutlet box 52 itself and before assembling the mounting platesubassembly thereto, simply seats the gasket ring 51 against the outletbox periphery,

- interfitting the two parts as just described,

whence the rubber ring remains in position and is ready to receive themounting plate thereagainst.

The mounting plate subassembly comprising the mounting plate 20 with thespacer elements 48 removed therefrom as above described and with theplug receptacle 38 forming a part thereof is now seated against thegasket ring 51 after bringing the circuit conductors through theapcrture 26 in the mounting plate, whereupon the relatively heavy flangeportion 57 of the gasket ring serves in effect to center the mountingplate 20 relative to the round outlet box 52 in that the outer wall 3|of the V-shaped flange is just receivable within the heavy rubber flange5'? whence the mounting plate subassembly is secured to the outlet boxby screws 58 that pass through suitable holes in the plate 25 and arethreaded into internal bosses or pillars 55 pro vided internally of thebox 52 and preferably cast integrally therewith. The screws and pillars;are preferably three in number, the holes in plate 2 1! for screws 58are preferably the abo e-- described holes 20* from which the spacerelements 48 have been removed, and the pillars 68 are correspondinglylocated, illustratively at the apex of a triangle. The screws 58 aresufficiently tightened up to effect suitable compression of the portionof the gasket ring 57 that intervenes the part 3H of the V-shaped flange3! and the front face of the rib 54 The circuit conductors are thenconnected to the binding screws 46, 46 of the plug receptacle.

The casing and signaling mechanism subassembly now assembled to theinstalled mounting plate subassembly in the manner above describedconnection with Figure l, but now the end annular o the casing portion I6 is brought 1 nst the rib-like portion 57 the go e so that upontightening the screws 2s the gasket ring 30 and the outer heavy portionof the gasket ring 51 are compressed to efiect sealing. The former iscompressed between the convex annular apex of the V-shaped flange 3a andthe casing wall portion it and the latter is compressed between the end.f; ce casing portion 16 and the face of the bot 544 the latter actioncomplementing the compression of the intermediate portion oi gasket ring57 between the flange part 3! a and i "ted when the mounting was securedto the outlet box. 1 any such .nstallations various of the coting featres oi construction above described 1e to make certain that the signal-:1 associated with the housing i6 lee in inverted position, and in theembodiments the housing opening 1) through which the striker 2| acgcngi? will always be in lowermost position which is of advantage in aerproof installation or which might be jita or desirable because of thechar- Jics of the electric actuating mechanism. n the mechanism shown inFigures 1 and 3, the

. 1 the casing 15.

cunit comprises a base plate 63 of nonterial sum as brass, shaped as inenarrower or restricted portion l d casing 56, preferably to an extentshown in Figure 1, the plane of its face coincides with the plane in theinial eo c of casing i6; plate 63 has lateral b B (Figure 3) whichoverlie to which plate 63 is secured by eby into bosses 65 formed in thethe casing ledge portion l6 to non of the casing wall portion l6 holesBecause of the increased ness of the ledge W, the lateral plate excne 63553 are joined to the plate 63 ri at led bends 53 and 63 as is bettertrative embodiments the signal-achanisrn comprises the winding l abovemen oned and coacting therewith a permai? t et PM the fluxes of both ofwhich con rol the movement of the plunger "nanent magnet PM isiilustratively in the form or" a rectangular a suitable alloy such asAlnico nagnetized to high and permait is desirably mounted'and sein amanner by which machincicci; can be avoided and preferably by means thatcoact with the mounting of the a1- the plate 53 thereof in the well orrestri ted portion of the casing i6. As shown in Figure 3 and also inFigure 6, the permanent magnet PM rests with its bottom face against theplate 63 and with a portion of its right-hand side face against theright-angled bend or flange 63 by the extension 63* of which the plate53 is secured by screws 5% to the casing it. The plate 63 is cut awaycentrally and in rectangular shape, as at 63 Figure 3, to provide arecess or aperture through which a portion the solenoid winding 5 withits end insulating discs or plates 66 can project and at one end of theopening 83 to provide also one or more upstanding ears or lugs 63", asshown in Figure to engage against the opposite side of the permanentmagnet PM, as is indicated also in Figure 6.

The block-like permanent magnet PM is en gaged at its opposite ends byend plates ti 6% which are provided with right-angled lugs or cars illthat rest flatwise' against the base plate 63 to which they are securedby screws ll, thus holding the magnet block PM against shifting inup-and-down direction as viewed in Figures 1 and 3. Plates 6? and 63 areprovided with bentover ears or lugs 61 and 68 which overlie the top faceof the magnet block PM and thus hold it against movement away from thebase plate 33.

End plates 5? and 63 are made of steel or other suitable paramagneticmaterial and form extension poles for the permanent magnet PM to a fluxgap within which is the winding id, as better appears in Figure 1, sothat the permanent magnet flux and that of the winding is can coactalong the axis of the solenoid winding within the channel or bore ofwhich, and subjected to the coacting fluxes, is the plunger The latteris suitably mounted and guided for reciprocation, by means of a tube 72of non-magnetic material, preferably brass. This tube passes through thebore of Winding i5 and through suitable apertures in the insulating endplates '36, t3 and is carried by the paramagnetic end plates 6?, 68which are coaxially apertured to receive the brass tube 72 with apress-fit, with the tube extending to both sides of the thus assembledwinding and pole extensions. In the upper end of guide tube '12 is acoiled spring it one end of which abuts against the plunger E32 and theother end of which abuts against a bent" up flange 63 of the base plate$3, flange 33 also fixing the position of the guide tube l2 relative tothe remaining parts. If desired, flange $3 and tube l2 may be securedtogether in any suitable way, as by soldering, though axial displacementpress-fit thereof in the pole plates 6i and E3 and in the heavyinsulating plates 55, St. The conductors 5, 35 (Figures 1 and 3) areconnected to the terminals of the winding it at the underside of thebase plate 63, thus completing the signal-actuating subunit, ready forassembly to the casing 26.

The bottom aperture it (Figures 1 2), in the casing portion ic is oi adiameter to receive the free end of guide tube '52 and is of sub tantialaxial extent, made so by thickening the casing wall portion it" bycasting a boss integrally with as is clearly shown in Figures 1 and 3.The signaling unit is let down into the casing, the conductors 65, 55are secured or soldered to the connecting tabs G5 and il or" theconnector block iii, and the unit is then slid along the porting ledgesin the casing so as to enter the free end of guide tube '52 in the longround hole inserted through the slots 63 $3 and into the threaded holesin the casing ledge and they are tightened up, preferably after testingthe mechanism in its action upon the gong H, by energizing the winding Iwith alternating current of, for example, 60 cycles, thus to achieve theoptimum setting of the parts. The plunger 62 is reciprocable to move itsupper end as seen in Figure 1 toward and away from the permanent magnetpole extension 6? while its lower end portion, during reciprocation,remains within the aperture of the other pole piece 58 for radial fluxflow therebetween. The flux of the permanent magnet, when winding I5 isde-energized, exerts an upward pull on the core or plunger 62 tending tolessen the axial flux gap between the upper end of the plunger and theextension pole 6'1, against the action of spring 13 which may thereby besomewhat compressed, and thus the striker 2! is held by the flux of thepermanent magnet in withdrawn position and out of contact with the gongi1.

When winding 55 is energized by pulsating or alternating current, theflux of the solenoid winding [5 aids or opposes that of the permanentmagnet PM and in coaction with the spring 13 effects synchronousreciprocation of the core and striker 2 l. The resultant action ispowerful, so much so that it is of advantage to maintain the line ofreciprocation of the plunger 62 substantially vertical, thus alsolessening the effects of friction and wear; the above-described featuresof assembly of the signaling mechanism and housing as one subunit to themounting plate subunit insure the achievement of such verticalrelationship of plunger actuation in a thoroughly dependable, practical,and foolproof manner.

In Figures 7 to 12 I have shown a modified form of construction andembodying also additional features of construction and coaction,particularly adaptable for signaling constructions and installations oflarger size and power than are above described, and in Figures 7 to 12the same reference characters are used as are employed in connectionwith Figures 1 to 6 to indi cate like or similar parts, excepting thatthe housing in Figures 7 to 12 is generally indicated by the referencecharacter IF, the mounting plate by the reference character and thesignaling mechanism base plate by the reference character 83*. As willbe clear from the applied reference characters, the various portions ofhousing 5* correspond generally with those described in connection withFigures 1 to 6, excepting that where the wall portion Hi of housing 16of Figure 1 is cylindrical throughout, in the modified form and as isbetter shown in Figures 7 and 10 the wall portion I6 is arcuate at itsupper and lower ends and is parallel-sided along chords of its circle,as is better shown in Figure 10 more compactly to accommodate theillustrative signal-actuating mechanism there employed. The base plateof the latter is generally rectangular (Figure 10) and can rest directlyupon the internal ledge formed by the transverse wall portion I6 towhich it is adjustably secured by screws 64 extending through slots 63and E3 and threaded into bosses 65 that provide a suitable mass of metalto accommodate the screws without penetrating the casing wall. Byshaping the wall l5 of the casing 16* as just described, I am enabled tosimplify the construction of the base plate 63*, eliminating theright-angled bends and extensions 63 ---63 and 63'=-B3 of Figure 3, andI am also enabled to simplify the positioning and securing of thepermanent magnet PM. As in the earlier form described, the permanentmagnet PM rests with its bottom face against the plate 63 which is cutaway or apertured as at B3 to provide one or more lugs 63* bent upwardlyas seen in Figure 10 (see also Figure 11) to engage one side of themagnet block, and the latter is held down against the plate 63* by lugs61 and 68 of the paramagnetic end plates 6! and 68 which in this formalso overlie and hold down edgewise against the base plate 63 companionpole extension plates 61 and 68 the latter being in effect duplicates ofpole extension plates 6'1 and 68 but without the lugs and ears in orderto provide a greater cross-section for carrying the flux of thepermanent magnet as better appears from Figures 7 and 12. At theright-hand side face of the permanent magnet PM (Figure 10) the baseplate 63 need not be supplied with any upstanding flange or lug and,instead, I utilize the adjacent housing wall I6 to hold the magnet blockagainst dislodgement in a direc tion to the right as viewed in Figure10, and for this purpose the inside face of wall IE is provided with aboss Hi which presents a small magnetengaging face parallel to the baseplate slots 53, 63 and so spaced from the line of adjustment permittedby the slots and screws that the righthand edge of base plate 83* andthe right-hand face of magnet block PM engage the face of boss As isbetter shown in Figures '7 and 12, the signal mechanism may be embodiedin larger and more powerful form than that of Figures 1 and 3, and inorder to gain certain other advantages the upper pole extension plates6? and iii are provided with an annular paramagnetic sleeve 75 for fluxconduction and to provide an internal axial flux gap between the lowerend of sleeve i5 and the lower pole extension plates 68 and G8", thesleeve '15 surrounding the plunger guide tube 12. With this constructionand arrangement of parts it is preferred not to press-fit the guide tube'12, though it serves to align the parts 6?, 15, 66, and 68 with the endsupporting plates 6i and 88 by which it and they are supported, theguide tube [2 passing through the apertures in each. Its free end is or"sufficient length to pass into the housing wall aperture Hi and asviewed in Figures '7 and 12 its upper end is spun or flanged over, as at2 to abut against the pole plate 6? to hold it against downwardmovement, and it is held against upward axial movement by the base plateflange (53 which in this form is bent up out of some of the material ofbase plate 63 that is removed to provide the rectangular aper ture 63 inwhich part of the solenoid winding i5 is accommodated. As in the form ofFigure l, the bent-up flange 53 forms an abutment for one end of thespring I3, but since in the form of Figures '7, l0 and 12 the spring canbe shorter, there is interposed between flange 63 and the end of thespring 13 a plug 16 of paramagnetic material.

The signal-actuating mechanism, assembled as a unit, is easily assembledto the housing It, being simply set down into the restricted or welllikeportion of the housing to bring the base plate 63 to rest on theabove-described ledges and other extensions, bringing the parallel slots63 and 63 into alignment with the screw holes for screws 64 and bringingthe right-hand face of permanent magnet block PM, as seen in Figure 10,alongside of the housing boss 16 the plunger guide tube I2 is enteredinto the bottom hole th of the housing by simply sliding the signalingunit to the desired extent whereupon the screws are inserted andtightened up, thus fixing the position of the mechanism and confiningthe permanent magnet block against movement to the right or left asviewed in Figure between the bent-up base plate lugs 63 and the housingboss 53 The conductors that lead from the winding are connected, asbefore, to the tabs of the plug connector All which in the form ofFigures 7 to 12 is also radially displaced, preferably along a verticaldiameter but below the center of latter, as is shown in Figures 7 and12, being secured as before by screws (as, 44 threaded. into bosses c2and 43 similarly oiiset below the center, as distinguished from theoffsetting radially above the center as in Figures 1 and 3.Corrcspondingly the insulating separator 3? (Figures 7 and 12) has itsaperture 31 similarly displaced downwardly from the center so that theplug prongs #l i l 1* project therethrough.

The companion receptacle connector part instead of being secured to themounting plate above the center as in Figures 1 and 2, is secured belowthe center as is better shown in Figures d l to locate it appropriatelyfor coaction the similarly downwardly displaced aper- El in theseparator plate 3i and with the prongs that project therethrough.

in the first form described, the mounting is provided with suitablydistributed n or holes by which it may be secured on ct boxes in anysuitable or usual form, and three triangularly disposed holes 29 achablespacer elements 43 where it is to be spaced from a wall surface, asshown gure 7, and with suitable holes which may e holes 2t with thespacers 4 8 knocked oil eiving screws 5 to secure it to a special 11 ofoutlet box 52*, in Figure 12, for weatherinstallation, the box 52 beingshown "al cross-section in Figure 12 and being genr the same as the box52 of Figure 5, e'-' cept- 12E" is larger and is of modified construcitseriphery for modified coaction with 1 zounting plate subassembly 20 Themounting plate 28 (Figures '7, 8, and 12) may be in the form of astamping oi suitably vy sheet metal and, as in the earlier form,provided with a V-shaped flange 31 whose or x apex coacts with thecushioning and sealing which, as before, is seated against "inc-r faceor ledge formed by the housing ion and is encompassed by the endhousportion 6 with which the frusto-conical 35 of the ii-shaped flange3! may coact by ing the two parts into concentric relation the housingsubassembly is secured to the installed mounting plate subassembly"Bisthe upper end of its vertical diameter as red in Figures '7, 8, and12, the mounting plate a tongue ll projecting upwardly and the largestcircumference of the V-shaped 1 3i, clearly shown in these figures, itbe formed by bending a portion of the outer frusto-conical part 3% outof the plane of latter and along a line so as not to interrupt or cityor" the convex apex of flange 3! a h rests against the ring 39. As isbetter shown in Figures 7, 10, and 12, the casing end porticn m providedwith an arcuate slot ill at e upper of its vertical diameter and intoich t mounting plate tongue 11 enters to an extent which is limited by alug '29 (see Figures 8 and 9) which is pressed out of the metal of thetongue il and is adapted to engage the inner face of the wall portion itas is better shown in Figures 7 and 12.

Accordingly, with the mounting plate subassembly 26* installed and withthe circuit conductors brought through the aperture HF and connected tothe receptacle member 38, the signaling mechanism and housing iSsubassembly is assembled thereto by first letting the housingdownwardly, as viewed in Figures 7, 10, and 12, relative to the mountingure-2w, while holding the lower portion of the housing assembly cantedto the left as viewed in Figures '7 and 12, thus permitting the tongue11 to enter the housing slot to an extent limited by the lug E9 on thetongue; the lower housing portion is then pressed inwardly, or towardthe right, thus subiecting the upper arcuate reaches of the yieldablering at to compression as that inward swinging movement of the housingbrings the ledge face seat of ring 30 closer to the convex apex of theV-shaped flange 3| and thus also bringing the screw 25 carried by thehousing IS near the lower end of its vertical diameter, into registrywith the threaded hole 89 provided in the suitably broadened or deformedportion of the apex of the V-shaped flange 3 as is clearly shown inFigures '7, 8, and 12. The stop lug 19 on the mounting plate tongue 71acts as a locator to position the housing IG at the right height tobring the screw 25 and the threaded hole 29 into registry. The screw 25*may now be tightened up, thus directly compressing the lower arcuatereaches of the ring 30 and further compressing the upper arouate reachesthereof by the resultant leverage action where the tongue i7 acts likeone end of a lever and the right-hand wall of slot 78 (Figures 7 and 12)acts like a fulcrum.

ihus effective sealirr action may be achieved and in an outdoor orweatherproof installation, as in Figure 12, sealed connection to theoutlet box 52* is achieved by a gasket 8! of rubber or the likeconstructed to coact with the \'-shaped flange 3! of the mounting plate29* and with an annular or ring shaped rib 5 similar to the rib 54 ofFigure 5 but positioned in the end edge face of the circular box wall 54so as to provide annular ledges or seats 54 and 56 to either side of therib 54 the latter, moreover, is of a mean diameter about the same as thediameter of the apex of the V-shaped plate flange 3!. The gasket 81 ismolded to give it an annular recess 8P into which the box rib enters andis seated, the resiliency of the side wall portions of this recess 81acting to grip the rib t l to hold the gasket 5! assembled to the wallbox peripl ery just prior to securing the mounting plate assembly iiitothe outlet box. The inountiplate Zil therefore need only be brought overthe gasket 8!, with its tongue El uppermost and the connector receptacle33 lowermost, the internal V-shape of the rib 3i neatly seating itselfover and against the companion V-shaped portion of the gasket Si andthus in effect virtually centering the mounting plate subassembly itrelative to the box 52 and thereby aiding aligning the screw holes inthe two for reception of the securing screws 58. With the three screws58 tightened up, the gasket 3! is cornpressed throughout its circularextent and as the screws 58 lessen the spacing between the internal apexof the V-shaped flange SI and the box rib 54 the rib 54 coacts with thetwo slan ing or frusto-conical wall portions of the V- shaped flange 3|to press the rubber of the ring 8| against these frusto-conicalsurfaces, thus achieving dependable sea-ling in addition to thecompression of other portions of the gasket ring 8i against otherportions of the two parts and 54. With the mounting plate 20* thusassembled to the box 52*, the housing subassembly EE is then assembledthereto in the manner above described and, as with the embodiment ofFigures l to 5, sealing is effected on both sides of the mounting plate.

In the two illustrative forms shown in the drawings (Figures 5 and 12)the gaskets 51 and 3t serve the same purpose of providing a seal betweenan outlet box and the mounting plate supported thereon and eachcooperates with the gasket 39 which is between the mounting plate andthe laterally extending step or flange ii? of the housing, to provide aninstallation well adapted for use for out of doors. Moreover, as .rownin the drawings, these parts coact with each other to facilitateassembly of the parts during installation and make for ease and facilityof dependable installation; as shown in Figures 5 and 12, the outletboxes engage the respective gaskets 5i and a: at the front or forwardends of the annular parts or side walls 55 of the outlet boxes, thedifferent shapes of the two gaskets providing in gasket 5'! a shoulderor flange 5'! fitting up around the outside of the V-shaped flange 3! ofthe mounting plate 28 (Figure 5) while gasket 8! is adapted to flt intothe groove or trough formed at the periphery of the mounting plate 20*(Figure 12) by the mutually inclined portions that form the V-shapedflange 3 i.

It will thus be seen that there has been provided by this invention anapparatus in which the various objects hereinabove set forth togetherwith many thoroughly practical advantages are successfully achieved. Asmany possible embodiments may be made of the above invention and as manychanges might be made in the embodiments above set forth, it is to beunderstood that all matter hereinbefore set forth 1 or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

I claim:

1. Signaling device mounting means comprising a circular mounting plateadapted to be secured to a support at the rear side thereof and having aV-shaped peripheral flange with the apex of the V-shaped flange exposedforwardly of the plate, and a housing of circular cross section havingone end open for coaction with said mounting plate and having successiveportions of lesser diameter so that it is stepped providing a pluralityof setbacks including a plurality of laterally and substantiallyradially extending wall portions separating wall portions of differentdiameter extending substantially at right angles to said laterallyextending portions, an annular ledge on the inner face of a wall portionintermediate adjacent laterally extending wall portions, and a disk-likeseparator plate adapted to be received within said housing and to restagainst said annular ledge to close off a portion of the interior ofsaid housing from a portion of the interior adjacent the open endthereof, with electro-responsive means within said closed-off portion ofthe housing, and means for detachably securing said separator plate tosaid annular ledge, the laterally extending wall portion nearest theopen end of the housing being juxtaposed to the apex of said V-shapedflange of said mounting plate with the endmost wall portion of thehousing which extends from said last-mentioned laterally extendingportion encompassing the said flange on the said mounting plate, andmeans carried by said last-mentioned laterally extending wall portion ofthe housing and by said mounting plate respectively for interengagingsaid housing and said mounting plate.

2. Signaling device mounting means comprising a mounting plate and meansfor attaching said mounting plate to a support surface, said mountingplate having screw receiving bore means adjacent its periphery whichproject forwardly of the plane of the plate, and a housing having anopen end for coaction with said plate and which is stepped from saidopen end providing a plurality of setbacks of decreasing cross sectionin a direction toward the other end of said housing and providing alaterally extending annular wall portion substantially parallel with thesupport surface on which the device is supported and spaced therefrom bya distance commensurate with the extent of forward projection of saidscrew-receiving bore means or the mounting plate, said mounting platebeing receivable within the open end of said housing with saidscrew-receiving bore means substantially juxtaposed to said lateralannular wall portion which has extending through it threaded screw meansof a length to terminate on the inside of the plane of said open end andadapted to register with the said forwardly projecting bore meansadjacent the periphery of said mounting plate for attaching said housingto said mounting plate.

3. The device as claimed in claim 2 provided with a separable plug andsocket combination of which one member has means mounting it within saidclosed-off portion of the housing and adjacent said separator plate andis in electrical connection with said electro-responsive means and theother has means mounting it on said mounting plate in a positionadjacent to and directed toward said separator plate, said mountingplate having aperture means for the passage therethrough of circuitconductors whereby the latter may be connected to said other member,said separator plate having a portion cut away to form aperture means topermit coacting assembly of said two members upon assembly of saidhousing to said mounting plate and to permit separation between said twomembers upon disassembly of said housing from said mounting plate.

4. The device as claimed in claim 2 in which the mounting plate has aV-shaped annular flange with the apex directed forwardly of the generalplane of the plate for entry into the housing in juxtaposition to saidlateral annular wall portion, said V-shaped flange projecting in saiddirection from a substantially flat central portion which is providedwith a number of difierent apertures adapted for attachment to any of anumber of known wall outlet boxes.

5. The device as claimed in claim 2 in which the mounting plate has aV-shaped annular flange with the apex directed forwardly of the generalplane of the plate for entry into the housing in juxtaposition to saidlateral annular wall portion, said V-shaped flange projecting in saiddirection from a substantially flat central portion which is providedwith a number of different apertures adapted for attachment to any of anumber of known wall outlet boxes, the aforesaid screw receiving boremeans in the periphery of said mounting plate being located in said V-shaped flange substantially along the bisector of the V of the flange.

6. A device of the kind described comprising a housing having an openend which is internally stepped to provide a plurality of internal sidewall seats facing toward its open end, a separator plate peripherallyseated against one of said seats intermediate of the ends of saidhousingand relatively adjacent but spaced from said open end to dividethe interior of the housing into a'relatively shallow portion at saidopen end of the housing and a relatively deeper portion on othed side ofthe separator plate, signalling means comprising electro responsivemeans in said deeper portion of the housing and having frame meansengaging with and secured to internal step seats of the housing, amounting plate adapted to be secured to a support and having aperturemeans for the passage therethrough of conductors, said mounting platehaving secured thereto one member of a plug and socket combination, saidmember being adapted for connection thereto of said conductors andprojecting into said shallow portion of the housing upon assembly of thehousing to the mounting plate, said housing having secured thereinexposed toward said open end thereof the other member of said plug andsocket combination which is connected to said electroresponsive means,and means comprising the open end portion of the housing and an internalseat adjacent thereto for interfitting and securing together saidmounting plate and the housing with said companion members of said plugand socket combination mutually aimed for coacting assembly of one tothe other as the housing is interfitted with and secured to the mountingplate.

7. A housing for an electrically operated signal device comprising ahousing having an open end and having electro-responsive means mountedand secured therein together with one member of a plug and socketcombination, said member being in electrical connection with saidelectro-responsive means and exposed toward said open end of thehousing, said housing having adjacent its open end an internal seatperipherally surrounded by a flange-like end portion of the housing, agasket of yieldable material seated against said seat and within saidflange-like end portion of the housing, a mounting plate adapted to besecured to a support and having aperture means for the passagetherethrough of conductors, said mounting plate being receivable withinsaid flange-like end portion and against said gasket, and means fordrawing and securing the housing and mounting plate together to placesaid gasket under compression, said mounting plate having securedthereto the other member of said plug and socket combination in aposition juxtaposed to said first-mentioned member for coacting assemblyof the plug prong contact means and the socket contact means thereof inresponse to movement of assembly of the housing to the mounting plateand continued approaching movement therebetween as said gasket is placedunder compression.

8. The device claimed in claim 7 in which said means for drawingandsecuringthe housing, and mounting plate together comprises a lateralslot in the flange-like end portion of the housing, said slot beinglocated between the end edge of the latter and the gasket seated againstsaid seat, a laterally projecting tongue on the mounting platereceivable into said slot and which must first be entered therein beforesaid plate is receivable within said flange-like end portion of thehousing and which is entered therein in response to initial relativelateral movement between the housing and the mounting plate and therebyalso locate the latter over said gasket, said tongue and slot thereafterserving as a fulcrum for relative pivotingmovement to enter the mountingplate completely within said flange-like end portion of the housing andthereby lock said tongue and slot against disengagement, and threadedmeans perioherally displaced from said slot and tongue for pivotallydrawing plate and housing together about said fulcrum as an axis and bythe resultant leverage action placing said gasket under compression.

9. The device claimed, in claim 7 in which the means for drawingandsecuring the housing and mounting plate together to place the gasketunder compression comprises screw means operable from the exterior ofthe housing and passing through said internal gasket seat and throughthe gasket itself to coact in holding the gasket assembled to said seatprior to assembly of the housing to the mounting plate and threaded holemeans in the mounting plate for receiving said screw means uponreception of the mounting plate within said flange-like end portion ofthe housing and against said gasket.

10. A mounting for a signal device operating means comprising a cup-likecasing and a mounting plate, said plate having a threaded hole adjacentits periphery and, said casing having an annular rim adapted to receivetherein and extend around said mounting plate, said annular rim of thecasing being spaced from and joined to the remainder of the casing by aninwardly and laterally extending flange, the said flange having a screwhole which may be brought into register with said threaded hole adjacentthe periphery of said mounting plate to receive a screw for joining thecasing to the mounting plate, the said casing having a slot extendingradially through its said annular rim and peripherally spaced from saidscrew hole, and said mounting plate having a radially extending tongueand similarly peripherally spaced from said threaded hole and adapted toenter said slot whereby to rotatively orient the casing and the plateand to orient the screw hole of the former with the threaded hole of thelatter, and a lug on the said tongue positioned to limit the extent towhich said tongue can be inserted through said slot and to therebyposition the said casing in radial direction relative to said mountingplate so that the screw hole in the said flange in the casing is inregister with the said screw hole in the mounting plate.

11. A signal device housing comprising a mounting plate having holes forthe passage therethrough of mounting screws, means for mounting themounting plate on a support comprising hollow spacers at the back of theplate for resting against the support, said spacers being attached tothe plate for easy removability by cylindrical parts that extendcoaxially into the screw holes in the plate and are shouldered at theends thereof adjacent the front face of the mounting plate and aredeformable for ease of detachment ofthe spacers where spaced mounting ofthe plate is not desired, mounting screws passed from the frontofsaidplate throughsaid holes andcylindrical parts and hollow spacers withtheir headed ends at said shouldered ends and their threaded endsentered into the support to clamp the plate and hollow spacers betweenthe support and their head ends, said mounting plate being thereby mesamounted in spaced relation from the support to provide space for thepassage of conductors therebetween and having aperture means for thepassage therethrough of conductors from said space to the front side ofthe mounting plate, and a casing having therein electro-responsive meansin electrical connection with said conductors passed through saidaperture means, said casing and said mounting plate having means forsecuring them together with the casing substantially closing over thefront of said mounting plate.

12. A closure and mounting for the operating means of an electric signaldevice comprising a casing and mounting plate assembly, electricsignal-operating means within said casing, said casing having aperipheral seat at one end for receiving peripheral portions of saidmounting plate to substantially align the latter with the casing, saidmounting plate having means for the passage therethrough of conductivemeans leading to said signal-operating means, a gasket in said seat, theperipheral portion of said mounting plate having a substantiallyV-shaped cross-section with the apex of the latter engaging said gasketand with the V-shaped trough-like portion thereof facing away from saidcasing and toward the support to which said mounting plate is to besecured, a gasket extending throughout said V-shaped trough-like portionand thereby interposed between the mounting plate and the support, andmeans for securing said casing and mounting plate together and to asupport to place said gaskets under compression.

13. A signal device mounting including a housing having thereinelectro-responsive means, a mounting plate having means for the passagetherethrough of circuit conductors and having holes to receive mountingscrews from the front side thereof, means for securing the housing toand at the front of the mounting plate, annular spacer studs on the backface of said mounting plate in alignment with said mounting holesrespectively with means detachably securing the studs to the mountingplate comprising easily deformable bushings extending into the holes inthe mounting plate and into said annular studs respectively, wherebymounting screws may be passed through the bushings and spacers to securethe mounting plate in spaced relation from a support and whereby saidannular spacer studs may be easily removed from the mounting plate wheremounting of the latter in spaced relation is not desired.

14. A closure and mounting for the operating means of an electric signaldevice comprising a casing open at its rear end, an outlet box open atits front end, and a mounting plate interposed therebetween, said outletbox having at its open end means forming a substantially peripheral seatfor a gasket and a gasket seated thereat, said mounting plate havingmeans for the passage therethrough of conductive means leading from saidoutlet box into said casing, said casing having a peripheral seat at itssaid rear end with a gasket seated thereagainst and said mounting platehaving a peripheral portion of substantially V-shaped cross-section withthe apex of the latter directed toward said casing with said apexengaging said second-mentioned gasket, said first-mentioned gasket andsaid outlet box seat therefor having coacting peripheral extents tojuxtaposition the gasket to a peripherally continuous part of the rearside of said V-shaped peripheral portion of the mounting plate; andmeans for securing said casing, mounting plate, and outlet box togetherwith said gaskets under compression.

15. A construction as claimed in claim 14 in which said casing isprovided with a peripheral flange-like portion that substantiallyenvelopes laterally said V-shaped portion of the mounting plate tobypass it in a direction toward the mounting plate and that extends intodirect engagement with said first-mentioned gasket to form a sealtherewith.

16. A construction as claimed in claim 14 in which said V-shapedperipheral portion of the mounting plate is formed by two substantiallyfrusto-conical wall portions presenting a V- shaped trough facing towardsaid outlet box, said peripherally continuous part comprising at leastone of said frusto-conical portions for engaging and resting againstsaid first-mentioned gasket.

17. A construction as claimed in claim 14 in which said V-shapedperipheral portion of the mounting plate is formed by two substantiallyfrusto-conical wall portions presenting a V- shaped trough facing towardsaid outlet box, said peripherally continuous part comprising at leastone of said frusto-conical portions for engaging and resting againstsaid first-mentioned gasket and said casing having an end peripheralwall portion substantially enveloping the outermost of saidfrusto-conical portions of the wall plate and terminating in engagementwith said first-mentioned gasket.

18. A construction as claimed in claim 14 in which said V-shapedperipheral portion of the mounting plate is formed by two substantiallyfrusto-conical wall portions presenting a V- shaped trough facing towardsaid outlet box, said peripherally continuous part comprising both ofsaid frusto-conical portions of the mounting plate for engaging againstsaid first-mentioned gasket.

19. A construction as claimed in claim 14 in which said V-shapedperipheral portion of the mounting plate is formed by two substantiallyfrusto-conical Wall portions presenting a V- shaped trough facing towardsaid outlet box, said first-mentioned gasket having a portion that isexternally V-shaped and received in said trough between thefrusto-conical portions of the mounting plate to coact in centering thebox relative to the mounting plate during assembly, said peripherallycontinuous part comprising both of the inside faces of said trough.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,486,896 Hubbell Mar. 18, 1924 1,603,884 Van Amberg Oct. 19,1926 1,665,802 Symmes Apr. 10, 1928 1,673,213 Sukumlyn June 12, 19282,105,573 Wilson Jan, 18, 1938 2,117,064 Ketay May '10, 1938 2,273,688Bolz et al Feb. 17, 1942

